A world different from our own. A group of Japanese students and their teacher are suddenly transported into a new world, where they are chosen to be a dungeon-crawling group of Braves to save humanity from the impending doom given to them by an A.W.O.L. Demon Lord. All the Summoned Otherworlders receive Skills to aid them in their journey and begin their investigation, some hoping to return home when it is all said and done.